Dipper for grooved drier drums



Sept. 5, 1950 L.. HoRNBosTEL. l-:TAL 2,521,371

. DIPPER RoR GRoovED DRIER DRUMS Filed May s, 194e 2 Sheets-#sheet 1Sept. 5, 1950 HORNBos-[EL ETAL 2,521,371

DIPPER FOR GROOVED DRIER DRUMS Filed May 8, 194e 2 sheets-shea f2 j112517. UFE m1/ Hoe/vaasrfz.

@@J/Ma@ mi Patented Sept. 5, 1950 v,UNITED STATES Pars-Nr OFFICEinfrarroja onoovooiomsa Daems Lloyd Hornbostel and John lGroodwillie,Beloit, Wis., assignors to Beloit Iron Works, Beloit, Wis., arcorporation of Wisconsin, l t

Application May s, 194e, serial N-of te,o59

heating non in the cylinder 'to the exterior dryin'g surface of thecylinder. The grooved drum or 'cylinder Vcons'ori'ioton makes possibleproduc-A tion o'f relatively lightweight thin walled heat conductingdrums th'atfar'e Suiciently strong to withstand high internalVpies's'ufr"es of' steam or vother 'heating `iluid. As a result 'of thisdru'm construction high 's'teain'pressures `can 'be used 'in the drum to'more 'efficiently heat'the cylinder surface of the drum.

Removal of steam brother heating 'fluid condensa'te from the 'interiorofthe grooved drum to prevent formation 'of 'insulating layers 'or poolsof condensate in the grooves is 'made possible, according to thisinvention, by Jdipper devices which extend lengthwise in the cylinderand have projections Veiiterrding into 'the valleys 'or grooves.

In a rst illustrated embodiment of'the invention, theseprojections 'take'the form of teeth or 6 ontims.f (ol. 34a-125) groove fitting tabs onthe 'back' wall "of a scoop the invention, a header pipe extendslengthwise oi 'the cylinder 'interior 'and has a lip member projectingforwardly therefrom to overlie vthe ribs. Angle members 'define 'troughsunder 'the lip between the header 'and apertured front Walls seated `inthe grooves. Fluid pass-es through the apertures in these 'front'walls'under 'the 'lip into and through 'the troughs lvinto the header. vin athird illustrated embodiment 'olf the invention, the header pipe lisequipped with forwardly 'projecting itubeswhich extend into the grooves.vin some instances only 'some of the "grooves or troughs in the cylinderreceive uid conducting tubes or conduit devices. For example inthe "illustrated third "embodiment of the inventionthe tubes only extend intoalternate grooves.

Itfis vthen an 'object off 'this invention `to pron videalll'ie'aitiri'g i for 'drying l'dill'lll 'Constructatably mounted invbearings tion having 'an internally grooved shell and a dipper orcondensate removal device extending into the grooves of the shell.

A 'further object of the invention is to provide an internally grooveddrier drum with a dipper having-local portionsv extending into thegrooves of the 'shell to remove uid therefrom.

A still further object of the invention is to provide a dipperconstruction for internally grooved drier drums or heating cylinders.

'Afstill further object of the invention is to pron vide a drier drumconstruction for paper ma chinos `and the like which has an internallyribbed drier shell and adipper extending into valleys between the ribsfor removing steam condensate-orthe like from the shell.

Other and further objects of the invention will be apparent to thoseskilled in the art from the 'following detailed description lof theannexed 'sheets off drawings which,l by Way of preferred exampleonly'illustrate several embodiments of the invention.vr j

- Figure-1 is ajside elevational view, with parts invertical -crosssection, illustrating an internally grooved drier drum equipped with'one form of clipper construction according to this invention.

Figure 2 isv av transverse Yfragmentary cross sectional' View, withparts in end elevation, taken along the line II-II of Fig. 1.

Figure 3 is a fragmentary longitudinal cross sectional View, with partsinside elevation, taken along the line III-III of Fig. 2. VFigure 4 is aview similar to Fig. 2 but illustratrng `la first modified embodiment ofthe invention.

Figure 5 is la longitudinal cross sectional View, 'with parts insideelevation, taken along the line V-V of Fig. 4'.

FigureA 6 is a longitudinal cross sectional view, with l'parts inelevation, taken along the line VI- VI of Fig. 4. j

Figure 7 is a View similar to Fig. 2 lbut illustrating'a, thi-rdembodiment oi the invention.

Figure 8 isa longitudinal cross sectional view, with parts in sideelevation, `taken along the line VIII-VIII of Fig. 7.

As shown on the drawings:

In Fig. 1 the reference numeral IIJ designatesA generally 'adrier rdrumconstruction having a cylindrical shell "Iil closed at its [ends by endheads 12, I2 carrying axles I3, I3 which .are roy I4 on support stands'I5.

The

ariesflrs lhaveportions 'fsa' 'amending into f the shell Il from theheads or ends I2 and receiving a separating plate I6 between theirproximate inner ends. The plate I6 is clamped between outturned flangesof the axle portions I 3a and is held in position by bolts extendedthrough these portions and the plate. Nozzles I1 extend from the plateI6 and communicate with the interior of the axle portion I3a on one sideof the plate I6. A steam feed pipe I8 extends through the axle portionI3 to supply steam to the interior of the portion I3a for feeding steaminto the shell II through the nozzles I'I. The axle portion I3@ on theother side of the plate IS has a condensate drain line I9 communicatingwith the interior thereof to remove condensate from the interior of theshell II. Therefore steam is introduced into the interior of the drumconstruction I through the axle I 3a on one side of the plate IS andcondensate is removed from the interior of the drum through the axleportion I3a on the other side of the plate I6.

The cylinder II is grooved around the inner face thereof to providecircular ribs around the inside of the cylinder between the heads I2.These ribs 20 are separated by valleys or grooves 2l. The valleys andribs can have any desired cross sectional shape. As illustrated in Fig.1 a substantially V-shaped cross section is utilized.

Dippers 22 are mounted in the drum ID in diametrioally opposed relationand extend lengthwise of the shell II between the end heads I2 of thedrum. Each dipper 22 is connected through a drain tube or pipe 23 withthe interior of the axle portion I3a on the drain side of the partitionplate I6,v Condensate from the dippers 22 is thereby removed throughthis axle portion I3a into the drain line I9.

Each dipper 22 has a back wall 22a as shown in Figs. 1 to 3 extendingalong the full length of the cylinder I I and equipped with a scallopedor tabbed free end portion 22h with recesses receiving the ribs 2B andtabs projecting into the bottoms of the grooves 2 I. A top wall 22eextends forwardly in the direction of rotation of the cylinder from thetop end of the back wall 22a and slopes downwardly to a portion 22dresting on top of the ribs 2i?. The top wall then extends inwardly alonga sweeping path toward the central portion of the cylinderY to provide ascoop-like lip 22e.

The dipper cooperates with the ribbed interior of the cylinder II toprovide an inlet mouth 24 having an appreciable width at its inlet endalong the entire length of the cylinder lI and converging to athroatportion 25 best shown in Fig. 2 which is divided into individualpassages by the ribs 20. The throat 25 is only as wide as the depth ofthe grooves 2l. The throat 25 then discharges into an enlarged chamber26 backed by the back wall 22a. This chamber 26 is emptied through anaperture 23a into the pipe 23 on the back wall 22a. l

The dippers 22 are aiixed to and rotate with the cylinder or shell I I.

In operation, condensate from the heating uid introduced into the drumby the nozzles I'I is scooped through the mouth portion 24 of a dipper22 and through theindividual throats 2-5 between the ribs. 22 into 'thechamber 26 of the dipper. The liquid '-,cannot flow out of the chamber25 because the back wall 22a of the dipper extends down into the groovesand either snugly engages the shell or has close clearance relationshiptherewith. As the drum rotates the dipper to levels above the drain line23, the uid in the chamber 26 will drain through the line 23 into theaxle I3a and then out through the drain line The dippers are effectivefor removing ponds of condensate at the bottom of the shell as well asfor removing films of condensate held by centrifugal force against ythegrooved interior of the shell provided of course that there films arethick enough to be retained by the tab portions 2217 on the back wall ofthe dipper. If desired the tabs can have a predetermined spacedrelationship with the grooves defining walls of the shell so that iilmsof desired thickness can remain in the grooves.

In the embodiment of the invention, shown in .Figs..4 to 6, theinternally grooved drier drum I0 is equipped with a modified arrangementof dippers 30. These dippers 30 each include a header pipe 3l extendingalong the length of the cylinder II. A forwardly projecting curved lipplate 32 is welded to the forward lower portion of the pipe 3l along thefull length of the pipe. A series of angle members 33 are welded to theunderface of the lip 32 and to the header pipe 3l to project from thepipe into the grooves 2I. Thus the angle members 33 are welded along thelongi tudinal edges of their side walls at 34 to the lip 32 as shown inFig. 6 and are welded at their back ends as at 35 to the pipe 3| asshown in Fig, 4.

The front ends of the angle members 33 are covered with triangularshaped Iplates 36 which are welded thereto. These plates 36 are alsowelded to the underface of the lip 32 and extend from the lip into thegrooves 2I to closely t alongside of the ribs 2li as shown in Fig. fl.The plates 36 have orifices or apertures 3l therein near their loweredges.

A series of chambers 38 are thereby provided under the lip '32 forreceiving condensate from the grooves 2I through the apertures 3l intheir leading lower front faces. The rear ends of these chambers 38communicate through apertures 39 with the interior of the header pipe ortube 3l. The tube 3l is drained by drain line 40 in the same manner asthe dippers 22.

The lip 32 projects forwardly from the tube 3l into contact with theapices of the ribs 2li and then curves inwardly toward the center of thecylinder II to provide a wide inlet mouth 4I converging to inlet throats42 in the grooves 2I which are backed by the plates 36 and are drainedthrough the orifices 3l.

Two dippers 3U in diametrically opposed relation are used in the drum I0in the same manner as the dippers 22 shown in Fig. 1.

The modified dipper arrangement of Figs. 4 to 6 operates in the samemanner as the dipper of Figs. 1 to 3 but includes individual passagewaysfrom the grooves of the drier cylinder to a common header pipe. AS inthe case of the dipper shown in Figs. 1 to 3, the modified dipper ofFigs. 4 to 6 rotates with the drum to scoop condensate from the interiorof the drum including the condensate contained in the grooves of thedrum cylinder.

In the embodiment shown in Figs. 7 and 8 the condensate in the interiorof the drum is removed by another form of dipper arrangement also usedin diametrically opposed pairs as shown in Fig. 1.

Each dipper A5 includes a longitudinally extending header pipe or tube46 drained by a drain line 4l and having a series of nozzle tubes 48projecting forwardly therefrom as shown. The

nozzle tubes 48 extend into some of the grooves 2| of the cylinder lland have open forward ends arranged for scooping uid contained in thegrooves into the header 46. As shown in Fig. 7 only alternate grooves 2|contain the tubes 48. Fluid in the grooves not containing the tubes 48can be removed by overflowing these grooves or by providingcommunicating passageways between the grooves (not shown).

In all embodiments of the invention the dipl per extends across the fulllength of the grooved cylinder and has means arranged for extending intothe grooves of the cylinder to scoop condensate or other fluid containedin these grooves into a drain line. The dippers rotate with the cylinderand can be securely aiiixed to the cylinder to prevent development ofloose parts and scraping action such as occurs with the use ofstationary dippers in a rotating cylinder.

It will, of course, be understood that various details of constructionmay be varied through a wide range without departing from the principlesof this invention and it is, therefore, not the purpose to limit thepatent granted hereon otherwise than necessitated by the scope of theappended claims.

We claim as our invention:

1. A dipper construction for use in an internally grooved drying drumhaving a plurality of spaced parallel, circumferential grooves aroundthe inner face thereof separated by circular ribs, said dipperconstruction comprising an elongated fluid conduit for overlying theribs of the drum along the length of the drum and having an aperturedback wall carrying projections for extending into the bottoms of thegrooves of said drum, a forwardly extending wall on said conduit forcontacting the tops of said ribs of the drum and a turned out lip on theforward end of said forwardly extending wall for forming an enlargedinlet entrance mouth to the chamber formed between said forwardlyextending wall and said drum for directing fluid into the conduit whilesaid projections dam off flow of the fiuid in the grooves beyond theback wall.

2. A clipper for use in an internally grooved drying drum having aplurality of spaced circumferential grooves around the inner facesthereof and separated by circular ribs, said dipper comprising anelongated fluid conduit extending along the length of said inner facesand having a back wall having an aperture therein and carryingprojections for extending into the grooves of said drum to preventtheflow of fluid in the grooves beyond the back wall, a forwardly extendingwall on said conduit for contacting the ribs of said drum, saidforwardly extending wall terminating in a turned out lip defining anenlarged entrance mouth to the inlet chamber formed by said forwardlyextending wall, and the inner face of said drum.

3. A dipper for use in an internally grooved drier drum having aplurality of spaced parallel circumferential grooves around the innerfaces thereof and separated by circular ribs, said dipper constructioncomprising a back wall portion having an aperture therein and ascalloped free lower edge arranged for closely fitting alternate groovesand ribs of the drum, a top wall portion extending forwardly from theupper edge of said back wall in spaced relation to said scalloped freelower edge, and a raised lip on the forward end of said top wall foroverlying said ribs in contact therewith to dene an enlarged inletmouth.

4. A dipper construction for use in an internally grooved drier drumhaving a plurality of spaced parallel circumferential grooves on theinner face thereof separated by circular ribs, said dipper constructioncomprising an elongated header pipe, a lip plate extending forwardlyfrom said header pipe along the length thereof and having an upturnedterminal lip extending forwardly from the upper free edge thereof, aplurality of V-shaped angle members along the length of the pipe beneathsaid plate to define back wall portions, said angle members cooperatingto denne a scalloped free lower edge arranged for closely ttingalternate grooves and ribs of the drum and cooperating with said lipplate to define a plurality of troughs underlying said lip plate,apertured front walls under the lip plate and cooperating with saidangle members and said lip plate to define front walls for said troughs,

and said header pipe having apertures therein joining the troughs withthe interior of said header pipe.

5. In an internally grooved drier drum having a plurality of spacedparallel grooves around the inner faces thereof and separated bycircular ribs, a dipper for removing condensate from said drumcomprising an elongated back wall extending axially of the drum andhaving an aperture therein together with depending lower projectionsextending edgewise into said grooves, said projections damming off thefree HOW of uid in the grooves, without covering an extended area of thecylinder wall, and an upper turned out lip extending forwardly of saidback wall and contacting the ribs of said drum beyond the dipper, andsaid turned out lip directing iiuid from said grooves against saidprojections and into said dipper, and a chamber dened by said back wallin cooperation with said projections and said lip for receiving iiuidscooped into the clipper by said projections.

6. A drier drum assembly comprising a rotatably mounted drum having acylindrical shell with alternate grooves and ribs extending around theinner face of the drum along the length thereof, a pair of diametricallyopposed dippers in said shell extending along substantially the axiallength of said shell, each of said dippers having an apertured back wallprovided with lower depending projections extending into said troughs todam off the free ow of fluid in said grooves beyond said dippers withoutcovering an appreciable area of the cylinder wall, and each of saiddippers having a forwardly projecting outturned lip extending from theupper edge of said back wall and contacting said ribs for directingfluid into the dipper associated therewith, and drain lines from saiddippers for emptying condensate therefrom.

LLOYD HORNBOSTEL.

JOHN E. GOODWILLIE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,108,077 Kilberry Aug. 18, 19141,248,589 Wyld Dec. 4, 1917 1,483,343 Gladin Feb. 12, 1924 1,670,113Harrison May 15, 1928 1,837,562 Mayer Dec. 22, 1931 1,919,416 Cram July25, 1933

